diff --git a/benches/Cargo.toml b/benches/Cargo.toml
index 1530430..f9d90d9 100644
--- a/benches/Cargo.toml
+++ b/benches/Cargo.toml
@@ -19,13 +19,9 @@ rand = { version = "0.8", default-features = false, features = [
     "std_rng",
     "getrandom",
 ] }
-# workaround for underspecified dependencies from criterion
-# see also https://github.com/RustCrypto/formats/pull/720
-regex = { version = "1.5.1", default-features = false }
-serde = { version = "1.0.144", default-features = false }
 
 [features]
-no_unroll = ["ascon?/no_unroll"]
+no_unroll = ["ascon/no_unroll"]
 
 [[bench]]
 name = "ascon"